Difference between magnitude and seismic intensity

It is a seismic intensity that showing the scale of the earthquake shows the level of the shake of the earth in the point by the magnitude. The seismic intensity doesn't have the figure below the decimal point though the magnitude has the figure below the decimal point though it is a numerical value that the magnitude and the seismic intensity look like.

The magnitude is a size of the energy of the earthquake.

The magnitude is what seismologist Richter in the United States designed it. This is the one (the conversion of the size of the energy of the earthquake into the figure and the expression). There is various kinds of computational methods of the magnitude, and the one that is called the Meteorological Agency magnitude is used in Japan.

Magnitude M of "Tohoku Great Kanto Earthquake" that had been generated on March 11, 2011 was M=9.0. The source region of this earthquake was about 500 km in length, and width reached about 200 km, and the destruction of the fault seems intermittently to have continued for five minutes or more. This was an earthquake of the maximum scale in Japan in the history of the observation. Moreover, it was the large one in fourth on world history.

Size of the Meteorological Agency magnitude M and scale of earthquake

• Less than 1---"Ultra micro-earthquake"
• From 1 to less than 3---"Microearthquake"
• From 3 to less than 5---"Moderate quake"
• From 5 to less than 7---Earthquake during ""
• 7 or more---"Large earthquake"

Relation between value of magnitude and scale of earthquake

The magnitude shows the gross energy of the earthquake. 0.1 increases by the magnitude and increases by a factor of 1.41 when growing the energy.

0.2 doubles by the magnitude and doubles when growing the energy. One increases by the magnitude and increases by a factor of 32 when growing the energy. Two increases by the magnitude and increases by a factor of about 1000 when growing the energy.

The seismic intensity is a level of the shake of the earth.

The seismic intensity shows the level of the shake of the earth in the point. The magnitude is another completely one. The shake of the earth in the point is decided depending on the ground condition etc. the distance, the focal depth, the spread route, and the point from energy and the hypocenter of the earthquake to the point peripheral.

The seismic intensity subdivides between 0-7 to ten stages in all.

The value of the seismic intensity is obtained by automatically converting it from the record of the seismic intensity meter of the seismic intensity observation point in nationwide various places into the seismic intensity.

Relation between seismic intensity and instrumental seismic intensity

• Seismic intensity 0 = measurement seismic intensity Less than 0.5
• Seismic intensity 1 = measurement seismic intensity 0.5- 1.5
• Seismic intensity 2 = measurement seismic intensity 2.5- 3.5
• Seismic intensity 3 = measurement seismic intensity 3.5- 4.5
• Seismic intensity 4 = measurement seismic intensity 4.5- 5.5
• Seismic intensity lower 5 = measurement seismic intensity 4.5- 5.0
• Seismic intensity upper 5 = measurement seismic intensity 5.0- 5.5
• Seismic intensity lower 6 = measurement seismic intensity 5.5- 6.0
• Seismic intensity upper 6 = measurement seismic intensity 6.0- 6.5
• Seismic intensity 7 = measurement seismic intensity More than 6.5

Past large earthquake of all parts of the world

The largest earthquake up to now was magnitude 9.5 of "Chile earthquake" that had occurred in the Chile coast in South America in 1960. 1600 people or more were sacrificed in this earthquake, the tsunami surged to Japan, and 142 victims went out.

A large-scale earthquake was "United States and Alaska earthquake" in 1964 and magnitudes 9.2 in second. The third was "Sumatran coast large earthquake" of Indonesia of 2004 and magnitude 9.1.

It was "Tohoku Great Kanto Earthquake" in which the fourth was generated on 11 days March, 2011 and the magnitude was 9.0. The source region of this earthquake was about 500 km in length, and width reached about 200 km, and the destruction of the fault seems intermittently to have continued for five minutes or more. This was an earthquake of the maximum scale in Japan in the history of the observation.